JPH023401Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a two-shaft tightening device in which an object to be tightened is tightened from both sides by a set of nut runners.

(Background of conventional technology) Conventionally, when tightening parts (bolts, nuts, etc.) of an object to be tightened, a worker uses an impact wrench to tighten the parts, and after tightening, uses a single-function wrench (QL
I was doing a torque check with a wrench, but
This tightening method has the drawback that productivity is significantly reduced because two steps, a tightening step using an impact wrench and a torque check step using a single-function wrench, must be performed in sequence. Furthermore, when the tightening torque increases, it becomes difficult to perform a torque check using a single-function wrench.

Therefore, in order to simplify the process by omitting the torque check using a single-function wrench, it is conceivable to use a hand-type nut runner with high tightening torque accuracy. However, when the operator tightens the tightening portion of the single shaft using the nut runner, the operator receives a reaction force immediately after the tightening is completed due to the structure of the nut runner. This reaction force increases as the torque increases, making it difficult for the operator to tighten the object with the nut runner.

The present invention was developed in view of this point, and aims to provide a hand-type two-axis tightening device that can cancel out the reaction force immediately after tightening is completed and perform high-torque tightening using a nut runner. .

(Means for solving the problem) The present invention is a hand-type two-shaft tightening device that is effective when tightening an object that has tightening parts on both sides. The following configuration was adopted as a means to counteract the force. That is, the technical means of the present invention is such that between the ends of a pair of bars extending in the left-right direction from the base provided with the positioning part for the fastened object,
The shafts are bridged so as to be parallel to each other, and a nut runner is attached to each of the shafts via a bracket so as to be rotatable and slightly movable in a direction perpendicular to the axis of the shaft. and the object to be tightened held in the positioning part are opposed between them, and the nut runner is connected to the base, and the nut runner is moved to a tightening position with respect to the object to be tightened and a retracting position retreated from the tightening position. The device is characterized in that it is provided with a drive means that rotates it largely between positions.

(Function) To tighten an object using this two-axis tightening device, after positioning the positioning part for the object to be tightened on the base to the object to be tightened, By rotating the nut runners toward the object to be tightened, the socket portions of the set of nut runners are fitted into the tightening portions on both sides of the object to be tightened. Moreover,
By operating a set of nut runners, the object to be tightened is simultaneously tightened from both sides thereof. In this way, by simultaneously tightening the tightening parts of two axes whose tightening directions differ by 180 degrees, the reaction forces that the operator receives immediately after completion of tightening cancel each other out, and high-torque tightening is performed.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 and 2 are a pair of bars extending in the horizontal direction;
are provided opposite to each other. A base 3 is installed between the substantially central portions of the pair of bars 1 and 2, and a positioning portion 5 for a clamped object is provided at the lower end of an arm 4 connected to the center portion of the lower surface of the base 3. . This positioning part 5 has an opening shaped part that expands downward so as to fit into the upper part of the object 6 to be fastened.

Shafts 7 and 8 are supported parallel to each other between both ends of the pair of bars 1 and 2. A nut runner 10 is rotatably attached to a portion of the shaft 7 on the bar 2 side via a bracket 9 toward the tightened object 6 side. A long hole 9a is formed in the shaft penetrating portion of the bracket 9 and extends in a direction perpendicular to the shaft 7. At the lower end of the nut runner 10, a nut (tightening part on one side) 6 of the object to be tightened 6 is attached.
A socket portion 11 for tightening the a is connected thereto. A stay 12 is installed at a location slightly above the bracket 9 of the nut runner 10, and the stay 12 is connected to the piston rod 13 of the air cylinder 13.
It is pin-coupled to a. The air cylinder 13 is
It is pin-coupled to the upper surface of one end of the base 3.

Similarly, a nut runner 15 is rotatably attached to the bar 1 side of the shaft 8 via a bracket 14 toward the tightened object 6 side. A long hole 14a extending perpendicularly to the shaft 8 is formed in the shaft penetrating portion of the bracket 14. A socket portion 16 for tightening a nut (the other side tightening portion) 6b of the object to be tightened 6 is coupled to the lower end of the nut runner 15 facing toward the socket portion 11 side. Bracket 14 of Natstranna 15
The stay 17 mounted slightly above is pin-coupled to a piston rod 18a of an air cylinder 18, and the air cylinder 18 is pin-coupled to the upper surface of the other end of the base 3.

Note that this two-axis tightening device is supported by a support device (not shown) so as to be movable in the vertical direction.
If necessary, it may be supported movably in the width direction of the positioning portion 5 (in the BB' direction in FIG. 1).

Next, the operation of the two-shaft tightening device configured as described above will be explained. In the initial state, the piston rods 13a, 1 of the air cylinders 13, 18
Since 8a is shortened, a pair of nut runners 1
0 and 15, socket portions 11 and 16 are open with shafts 7 and 8 as fulcrums. Now, when the entire two-axis tightening device is lowered, the positioning part 5 of the base 3 is fitted onto the upper part of the object to be tightened (which has been set in a predetermined position in advance) 6, as shown in FIG. position. After positioning, air cylinder 13,
18 piston rods 13a, 18a are extended and the socket portions 11, 1 of the nut runners 10, 15 are opened.
6 is closed, the socket portions 11 and 16 are fitted into the nuts 6a and 6b of the object to be tightened 6 and set. When the socket parts 11, 16 are set on the nuts 6a, 6b, the nut runners 10, 15 rotate in the direction of closing each other, and the brackets 9, 14
The nuts 6a, 6b move along their long holes 9a, 14a in the axial direction of the nuts 6a, 6b. For this reason, nuts 6a, 6b
The socket parts 11 and 16 can be fitted and fitted smoothly.

Socket portion 1 of a pair of nut runners 10 and 15
1 and 16 are fitted into the nuts 6a and 6b of the object 6 to be tightened from both sides, by operating the nut runners 10 and 15, the nuts 6a and 6b of the object 6 to be tightened are fitted.
Tighten 6b at the same time. In this way, when the nuts 6a and 6b are tightened at the same time in 180 degrees different directions, the reaction forces that the operator receives immediately after the tightening is completed cancel each other out, and even when the tightened object 6 has a high tightening torque, The operator can easily perform tightening work without receiving a large reaction force.

In addition, in the embodiment, a positioning portion configured to externally fit onto the upper part of the object to be tightened was adopted, but the present invention is not limited to this. It is also possible to adopt a configuration in which the grooves and grooves fit together.

(Effect of the invention) As explained above, according to the invention, it is possible to simultaneously tighten the tightening parts on both sides of the object to be tightened, so that the reaction forces that the operator receives immediately after the completion of tightening are canceled out. Therefore, high torque tightening can be easily performed with high accuracy using the nut runner.

In addition, since it can be made into a unit and has the necessary functions as a hand type, it has great utility value.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a partially cutaway view taken along arrow A in FIG. 2, and FIG. 2 is a plan view thereof. 2... Base, 5... Positioning part for fastened object, 6
...Tightened object, 6a, 6b... Nut (tightening part), 10, 15... Nut runner, 11, 16
...Socket part, 13, 18...Air cylinder.

Claims (1)

[Scope of utility model registration request] Shafts are bridged between both ends of a pair of bars extending in the left-right direction from a base provided with a positioning part for the tightened object so as to be parallel to each other,
A nut runner is attached to each of the shafts via a bracket so as to be rotatable and slightly movable in a direction perpendicular to the axis of the shaft, and the socket portion of each nut runner is connected to the tightened object held in the positioning portion. A driving means is provided between the nut runner and the nut runner to face each other, and to connect the nut runner to the base, and to rotate the nut runner largely between a tightening position with respect to the object to be tightened and a retracted position retreated from the tightening position. A two-shaft tightening device characterized by: